f20d5aa0e2
- Create docs/ with 7 focused files: architecture, api, scoring, agent, deployment, freeswitch, development - Rewrite README.md as concise overview with links to docs/ - Remove AGENTS.md (content merged into docs/ and README)
118 lines
7.4 KiB
Markdown
118 lines
7.4 KiB
Markdown
# Architecture
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## Overview
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pulse-lets-go — балансировщик телефонной нагрузки на базе FreeSWITCH + NATS.
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Агенты PBX отправляют метрики в NATS каждые 5 секунд. Балансировщик вычисляет weighted score готовности каждой ноды, кэширует лучшую и отдаёт её FreeSWITCH через `/api/route` для следующего звонка.
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## Data Flow
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```
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┌─────────────────────┐ ESL/AMI ┌──────────────────────┐
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│ PBX-01 │──────────▶│ pulse-lets-go-agent │
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│ (FS or Asterisk) │ collect │ (on each PBX node) │
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├─────────────────────┤ ├──────────────────────┤
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│ PBX-02 │──────────▶│ pulse-lets-go-agent │
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│ (FS or Asterisk) │ ├──────────────────────┤
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├─────────────────────┤ ├──────────────────────┤
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│ PBX-N │──────────▶│ pulse-lets-go-agent │
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│ (FS or Asterisk) │ └─────────┬────────────┘
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└─────────────────────┘ │ pulse.metrics.<id>
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│ every 5s
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▼
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┌──────────────┐
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│ NATS Server │
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│ nats://:4222 │
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└──────┬───────┘
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│
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▼
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┌──────────────────────┐
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│ pulse-lets-go │
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│ │
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│ ┌────────────────┐ │
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│ │ NATS Sub │ │
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│ │ (pulse.metrics)│ │
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│ └────────┬───────┘ │
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│ ▼ │
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│ ┌────────────────┐ │
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│ │ Engine │ │
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│ │ (scoring) │──│──▶ /api/route
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│ └────────┬───────┘ │ ↓
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│ ▼ │ FreeSWITCH bridge
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│ ┌────────────────┐ │ sip:pbx-03:5060
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│ │ REST API │──│──▶ /api/nodes
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│ │ (JWT auth) │ │ /api/trunks
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│ └────────┬───────┘ │ /api/users
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│ ▼ │
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│ ┌────────────────┐ │
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│ │ WebSocket │──│──▶ SvelteKit UI
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│ └────────────────┘ │ (ws://:8080/ws/metrics)
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│ ┌────────────────┐ │
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│ │ ESL Client │──│──▶ FreeSWITCH ESL
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│ │ (gateways) │ │ :8021
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│ └────────────────┘ │
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│ ┌────────────────┐ │
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│ │ Monitoring │──│──▶ /api/monitoring/prometheus
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│ │ (API-key) │ │ /api/monitoring/zabbix
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│ └────────────────┘ │
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└──────────────────────┘
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```
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## Components
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| Component | Role |
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|-----------|------|
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| **pulse-lets-go** | Central balancer: NATS subscriber, scoring engine, REST API, WebSocket hub, ESL client |
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| **pulse-lets-go-agent** | Per-PBX metrics collector (FreeSWITCH ESL / Asterisk AMI) |
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| **NATS** | Message bus — `pulse.metrics.<node_id>` subject |
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| **FreeSWITCH** | Softswitch — uses `route.lua` + `mod_curl` to query `/api/route` |
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| **SvelteKit UI** | Dashboard with real-time metrics via WebSocket |
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## Tech Stack
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| Component | Technology |
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|-----------|-----------|
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| Backend | Go 1.26, stdlib `net/http` + `http.ServeMux` |
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| Frontend | SvelteKit 2 + Tailwind CSS 4 + Lucide |
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| Auth | JWT (golang-jwt/v5, HS256) + bcrypt |
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| Message bus | NATS (nats.go) |
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| Storage | JSON files (`data/`) |
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| ESL | Raw TCP (no external libraries) |
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| Deployment | Single binary + systemd |
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## Data Flow Summary
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1. **Agent** collects metrics from PBX (ESL/AMI + /proc) every 5s
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2. **Agent** publishes `pulse.metrics.<node_id>` to NATS
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3. **Balancer** NATS subscriber receives metrics, updates in-memory node state
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4. **Scoring engine** recalculates scores, caches best node
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5. **FreeSWITCH** dialplan calls `/api/route` via `mod_curl`
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6. **Balancer** returns best node's `sip_gateway` (O(1) from cache)
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7. **FreeSWITCH** bridges the call to the returned gateway
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## Project Structure
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```
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pulse-lets-go/
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├── cmd/
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│ ├── pulse-lets-go/ # Main entry point
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│ ├── pulse-lets-go-agent/ # Metrics collector agent (FS / Asterisk)
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│ ├── emulator/ # Metrics emulator for testing
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│ └── siptest/ # SIP tester for e2e checks
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├── internal/
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│ ├── api/ # HTTP handlers (auth, nodes, trunks, users, monitoring, ws, route)
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│ ├── config/ # JSON config manager (atomic save, thread-safe)
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│ ├── engine/ # Scoring engine + router (sync.RWMutex, best-node cache)
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│ ├── esl/ # FreeSWITCH ESL client (raw TCP)
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│ ├── ami/ # Asterisk AMI client (raw TCP)
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│ ├── log/ # ASCII metrics logger with rotation
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│ ├── models/ # Data types (NodeMetric, NodeState, Trunk, User, ...)
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│ └── nats/ # NATS subscriber
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├── contrib/ # route.lua, agent configs
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├── deploy/ # systemd unit
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├── web/ # SvelteKit frontend
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├── data/ # Runtime JSON files (gitignored)
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└── docs/ # Documentation
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```
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